fix SortDirection default to descending when retrieved data is ascending

osu.Game.Tests/Visual/TestCaseSocial.cs

@@ -1,13 +1,22 @@
 // Copyright (c) 2007-2017 ppy Pty Ltd <contact@ppy.sh>.
 // Licensed under the MIT Licence - https://raw.githubusercontent.com/ppy/osu/master/LICENCE
 
+using System;
+using System.Collections.Generic;
 using osu.Game.Overlays;
+using osu.Game.Overlays.Social;
 using osu.Game.Users;
 
 namespace osu.Game.Tests.Visual
 {
     public class TestCaseSocial : OsuTestCase
     {
+        public override IReadOnlyList<Type> RequiredTypes => new[]
+        {
+            typeof(FilterControl),
+            typeof(SocialOverlay)
+        };
+
         public TestCaseSocial()
         {
             SocialOverlay s = new SocialOverlay

osu.Game/Overlays/SocialOverlay.cs

@@ -204,7 +204,7 @@ namespace osu.Game.Overlays
 
     public enum SortDirection
     {
-        Descending,
         Ascending,
+        Descending
     }
 }